Using Synthetic Aperture Lensless Fourier Digital Holography Enhance DMD Display Holographic Reconstructed Image

摘要

A signification characteristic is found by analyzing lensless Fourier digital hologram and synthetic aperture holography that is the imaging surface of reconstructed image of lensless Fourier digital hologram just is focus plane of positive lens that is unrelated with wavelength of restruction and recording and their ratio. The nature is propitious to resolve the problem of DMD display caused by unstable holographic imaging surface. Zero order diffraction image is focused on nearby center of focal surface and imaging zone is rapidly contracted that largely improved quality of reconstructed image. Meanwhile, position of holographic reconstructed image is not to be altered when parallel moving lensless Fourier digital holography on the holographic image plane that is easier to improve hologram duty cycle ,DMD availability and quality of reconstructed image with theory of synthetic aperture that attained by single illumination. According to this analysis, a new method is proposed that combine lensless Fourier digital holography with synthetic aperture that could improve quality of DMD reconstructed image. We provided laboratory results and verified all theory analysis that totally proved the method is available and feasible.